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/*
* qrencode - QR Code encoder
*
* Input data splitter.
* Copyright (C) 2006-2011 Kentaro Fukuchi <kentaro@fukuchi.org>
*
* The following data / specifications are taken from
* "Two dimensional symbol -- QR-code -- Basic Specification" (JIS X0510:2004)
* or
* "Automatic identification and data capture techniques --
* QR Code 2005 bar code symbology specification" (ISO/IEC 18004:2006)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "qrencode.h"
#include "qrinput.h"
#include "qrspec.h"
#include "split.h"
#define isdigit(__c__) ((unsigned char)((signed char)(__c__) - '0') < 10)
#define isalnum(__c__) (QRinput_lookAnTable(__c__) >= 0)
#if !HAVE_STRDUP
#undef strdup
char *strdup(const char *s)
{
size_t len = strlen(s) + 1;
void *new = malloc(len);
if(new == NULL) return NULL;
return (char *)memcpy(new, s, len);
}
#endif
static QRencodeMode Split_identifyMode(const char *string, QRencodeMode hint)
{
unsigned char c, d;
unsigned int word;
c = string[0];
if(c == '\0') return QR_MODE_NUL;
if(isdigit(c)) {
return QR_MODE_NUM;
} else if(isalnum(c)) {
return QR_MODE_AN;
} else if(hint == QR_MODE_KANJI) {
d = string[1];
if(d != '\0') {
word = ((unsigned int)c << 8) | d;
if((word >= 0x8140 && word <= 0x9ffc) || (word >= 0xe040 && word <= 0xebbf)) {
return QR_MODE_KANJI;
}
}
}
return QR_MODE_8;
}
static int Split_eatNum(const char *string, QRinput *input, QRencodeMode hint);
static int Split_eatAn(const char *string, QRinput *input, QRencodeMode hint);
static int Split_eat8(const char *string, QRinput *input, QRencodeMode hint);
static int Split_eatKanji(const char *string, QRinput *input, QRencodeMode hint);
static int Split_eatNum(const char *string, QRinput *input,QRencodeMode hint)
{
const char *p;
int ret;
int run;
int dif;
int ln;
QRencodeMode mode;
ln = QRspec_lengthIndicator(QR_MODE_NUM, input->version);
p = string;
while(isdigit(*p)) {
p++;
}
run = p - string;
mode = Split_identifyMode(p, hint);
if(mode == QR_MODE_8) {
dif = QRinput_estimateBitsModeNum(run) + 4 + ln
+ QRinput_estimateBitsMode8(1) /* + 4 + l8 */
- QRinput_estimateBitsMode8(run + 1) /* - 4 - l8 */;
if(dif > 0) {
return Split_eat8(string, input, hint);
}
}
if(mode == QR_MODE_AN) {
dif = QRinput_estimateBitsModeNum(run) + 4 + ln
+ QRinput_estimateBitsModeAn(1) /* + 4 + la */
- QRinput_estimateBitsModeAn(run + 1) /* - 4 - la */;
if(dif > 0) {
return Split_eatAn(string, input, hint);
}
}
ret = QRinput_append(input, QR_MODE_NUM, run, (unsigned char *)string);
if(ret < 0) return -1;
return run;
}
static int Split_eatAn(const char *string, QRinput *input, QRencodeMode hint)
{
const char *p, *q;
int ret;
int run;
int dif;
int la, ln;
la = QRspec_lengthIndicator(QR_MODE_AN, input->version);
ln = QRspec_lengthIndicator(QR_MODE_NUM, input->version);
p = string;
while(isalnum(*p)) {
if(isdigit(*p)) {
q = p;
while(isdigit(*q)) {
q++;
}
dif = QRinput_estimateBitsModeAn(p - string) /* + 4 + la */
+ QRinput_estimateBitsModeNum(q - p) + 4 + ln
- QRinput_estimateBitsModeAn(q - string) /* - 4 - la */;
if(dif < 0) {
break;
} else {
p = q;
}
} else {
p++;
}
}
run = p - string;
if(*p && !isalnum(*p)) {
dif = QRinput_estimateBitsModeAn(run) + 4 + la
+ QRinput_estimateBitsMode8(1) /* + 4 + l8 */
- QRinput_estimateBitsMode8(run + 1) /* - 4 - l8 */;
if(dif > 0) {
return Split_eat8(string, input, hint);
}
}
ret = QRinput_append(input, QR_MODE_AN, run, (unsigned char *)string);
if(ret < 0) return -1;
return run;
}
static int Split_eatKanji(const char *string, QRinput *input, QRencodeMode hint)
{
const char *p;
int ret;
int run;
p = string;
while(Split_identifyMode(p, hint) == QR_MODE_KANJI) {
p += 2;
}
run = p - string;
ret = QRinput_append(input, QR_MODE_KANJI, run, (unsigned char *)string);
if(ret < 0) return -1;
return run;
}
static int Split_eat8(const char *string, QRinput *input, QRencodeMode hint)
{
const char *p, *q;
QRencodeMode mode;
int ret;
int run;
int dif;
int la, ln;
la = QRspec_lengthIndicator(QR_MODE_AN, input->version);
ln = QRspec_lengthIndicator(QR_MODE_NUM, input->version);
p = string + 1;
while(*p != '\0') {
mode = Split_identifyMode(p, hint);
if(mode == QR_MODE_KANJI) {
break;
}
if(mode == QR_MODE_NUM) {
q = p;
while(isdigit(*q)) {
q++;
}
dif = QRinput_estimateBitsMode8(p - string) /* + 4 + l8 */
+ QRinput_estimateBitsModeNum(q - p) + 4 + ln
- QRinput_estimateBitsMode8(q - string) /* - 4 - l8 */;
if(dif < 0) {
break;
} else {
p = q;
}
} else if(mode == QR_MODE_AN) {
q = p;
while(isalnum(*q)) {
q++;
}
dif = QRinput_estimateBitsMode8(p - string) /* + 4 + l8 */
+ QRinput_estimateBitsModeAn(q - p) + 4 + la
- QRinput_estimateBitsMode8(q - string) /* - 4 - l8 */;
if(dif < 0) {
break;
} else {
p = q;
}
} else {
p++;
}
}
run = p - string;
ret = QRinput_append(input, QR_MODE_8, run, (unsigned char *)string);
if(ret < 0) return -1;
return run;
}
static int Split_splitString(const char *string, QRinput *input,
QRencodeMode hint)
{
int length;
QRencodeMode mode;
if(*string == '\0') return 0;
mode = Split_identifyMode(string, hint);
if(mode == QR_MODE_NUM) {
length = Split_eatNum(string, input, hint);
} else if(mode == QR_MODE_AN) {
length = Split_eatAn(string, input, hint);
} else if(mode == QR_MODE_KANJI && hint == QR_MODE_KANJI) {
length = Split_eatKanji(string, input, hint);
} else {
length = Split_eat8(string, input, hint);
}
if(length == 0) return 0;
if(length < 0) return -1;
return Split_splitString(&string[length], input, hint);
}
static char *dupAndToUpper(const char *str, QRencodeMode hint)
{
char *newstr, *p;
QRencodeMode mode;
newstr = strdup(str);
if(newstr == NULL) return NULL;
p = newstr;
while(*p != '\0') {
mode = Split_identifyMode(p, hint);
if(mode == QR_MODE_KANJI) {
p += 2;
} else {
if (*p >= 'a' && *p <= 'z') {
*p = (char)((int)*p - 32);
}
p++;
}
}
return newstr;
}
int Split_splitStringToQRinput(const char *string, QRinput *input,
QRencodeMode hint, int casesensitive)
{
char *newstr;
int ret;
if(string == NULL || *string == '\0') {
errno = EINVAL;
return -1;
}
if(!casesensitive) {
newstr = dupAndToUpper(string, hint);
if(newstr == NULL) return -1;
ret = Split_splitString(newstr, input, hint);
free(newstr);
} else {
ret = Split_splitString(string, input, hint);
}
return ret;
}